Unusual Plasma Formations Produced by Positive Streamers Entering the Cloud of Negatively Charged Water Droplets
Unusual Plasma Formations Produced by Positive Streamers Entering the Cloud of Negatively Charged Water Droplets
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DOI：
10.1029/2021jd035821
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发表时间：
2021-09
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影响因子：
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通讯作者：
A. Kostinskiy;N. Bogatov;V. Syssoev;E. Mareev;M. Andreev;M. Bulatov;D. Sukharevsky;V. Rakov
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文献类型：
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作者：
A. Kostinskiy;N. Bogatov;V. Syssoev;E. Mareev;M. Andreev;M. Bulatov;D. Sukharevsky;V. Rakov
Kostinski等人。(2015b)，https://doi.org/10.1002/2015GL065620，使用高速红外(2.5-5.5μm)相机，在带电水滴的人造云中发现了所谓的不寻常的等离子体形成(UPF)。UPFS具有复杂的形态，既包括流光状区域，也包括热通道段。他们是在存在和不存在从接地平面向云层发展的热先导通道的情况下观察到的。在这篇文章中，我们描述了两个UPF，它们发生在从接地面发射的正极性的初始电晕流光中，在相关的热引线通道形成之前(或在没有的情况下)。这些流光爆发以5-7×10~5m/S的速度发展超过1-1.5m，然后进入光学可见的负电荷云并在其外围产生超频闪。UPF内的热通道段在非常短的时间内形成，约为1μ，S或更少。目前尚不清楚UPF是由带电云边界附近的电场增强引起的，还是其他因素也起到了作用。UPF的发生可能是闪电引发过程中的一个必要组成部分。
Kostinskiy et al. (2015b), https://doi.org/10.1002/2015GL065620, using a high‐speed infrared (2.5–5.5 μm) camera, discovered the so‐called unusual plasma formations (UPFs) in artificial clouds of charged water droplets. UPFs had complex morphology including both streamer‐like regions and hot channel segments. They were observed both in the presence and in the absence of hot leader channels developing from the grounded plane toward the cloud. In this paper, which is aimed at revealing the genesis of UPFs, we present two UPFs that occurred inside the initial corona streamer burst of positive polarity emitted from the grounded plane, prior to the formation (or in the absence) of associated hot leader channel. These streamer bursts developed at speeds of 5–7 × 105 m/s over 1–1.5 m before entering the optically visible negatively charged cloud and producing UPFs at its periphery. Hot channel segments within UPFs were formed in very short times of the order of 1 μs or less. It is not clear if the UPFs were caused solely by the enhanced electric field near the charged cloud boundary or other factors also played a role. Occurrence of UPFs may be a necessary component of the lightning initiation process.